---
title: "Kakadu 120 — Sizing with the Selectronic SP PRO SPLC1200 / SPLC1202"
revision: "1.0.1"
publisher: AERL (Australian Energy Research Laboratories)
url: https://www.aerl.com.au/docs/kakadu-splc12xx-sizing
pdf: https://www.aerl.com.au/documents/guides/AERL_Kakadu_120V_SPLC12xx_Sizing_Guide_REV_101.pdf
description: "Sizing guidance for pairing the Kakadu 120V battery with the Selectronic SP PRO SPLC1200 or SPLC1202 inverter-charger, covering voltage window and DC current draw versus battery limits."
---

# Kakadu 120 — Sizing with the Selectronic SP PRO SPLC1200 / SPLC1202

*Rev 1.0.1. Markdown copy of the AERL document at https://www.aerl.com.au/docs/kakadu-splc12xx-sizing; the PDF (https://www.aerl.com.au/documents/guides/AERL_Kakadu_120V_SPLC12xx_Sizing_Guide_REV_101.pdf) is the controlled version.*

Battery Sizing

# Sizing the AERL Kakadu 120 with the Selectronic SP PRO SPLC1200 / SPLC1202

**Pairing rule:** 1 × SP PRO 120 V inverter (SPLC1200 or SPLC1202) ↔ 1 × Kakadu 120 battery cabinet.

This sheet confirms that a single Kakadu 120 has the discharge-current capability to support a single SPLC1200 **or** SPLC1202 across all of its rated AC load periods.

![AERL Kakadu 120 battery cabinet with door opened](https://www.aerl.com.au/docs/_assets/assets/images/kakadu/aerl-kakadu-cabinet-door-opened.png)

*AERL Kakadu 120 battery cabinet*

## Key Parameters

Inverter (120 V class)

| Parameter | SPLC1200 | SPLC1202 |
|---|---|---|
| Nominal DC input | 120 V (100–162 V) | 120 V (100–162 V) |
| Continuous AC output | 15.0 kW | 20.0 kW |
| Peak efficiency | 97.2% | 97.2% |
| Max continuous charge | 15.0 kW / 125 A | 20.0 kW / 167 A |

Kakadu 120 (battery)

| Parameter | Value |
|---|---|
| Nominal voltage | 140.8 V (112.2–165 V) |
| Max continuous discharge | **300 A** (150 A/string) |
| Peak discharge (1 min) | **315 A** |
| Peak discharge (5 s) | 400 A / 42.2 kW |
| Max continuous charge | 300 A |
| Capacity | 88.4 kWh / 628 Ah (up to 90% DoD) |

Both inverters share the same 120 V DC class, so each sits within the Kakadu's operating window (≈112–162 V overlap) throughout discharge.

## DC Current Draw vs. Battery Limit

DC current is calculated from the SP PRO AC load ratings, referred back through the inverter:

**I_dc = P_ac ÷ (η × V_dc)** with η = 97.2%.

Two voltages are shown: **nominal (140.8 V)** for the typical case, and **minimum (112.2 V)** for the worst case near end-of-discharge, where current is highest.

| Inverter | Load period | SP PRO AC power | DC power (÷97.2%) | I_dc @ 140.8 V | I_dc @ 112.2 V (worst case) | Kakadu limit | Result |
|---|---|---|---|---|---|---|---|
| SPLC1200 | Continuous 24/7 | 15.0 kW | 15.43 kW | 110 A | 138 A | 300 A continuous | Pass |
| SPLC1200 | 60 minutes | 18.0 kW | 18.52 kW | 132 A | 165 A | 300 A continuous | Pass |
| SPLC1200 | 30 minutes | 23.0 kW | 23.66 kW | 168 A | 211 A | 300 A continuous | Pass |
| SPLC1200 | 1 minute | 26.0 kW | 26.75 kW | 190 A | 238 A | 315 A (1 min peak) | Pass |
| SPLC1202 | Continuous 24/7 | 20.0 kW | 20.58 kW | 146 A | 183 A | 300 A continuous | Pass |
| SPLC1202 | 60 minutes | 24.0 kW | 24.69 kW | 175 A | 220 A | 300 A continuous | Pass |
| SPLC1202 | 30 minutes | 30.0 kW | 30.86 kW | 219 A | 275 A | 300 A continuous | Pass |
| SPLC1202 | 1 minute | 35.0 kW | 36.01 kW | 256 A | 321 A | 315 A (1 min peak) | Pass\* |

*\*In the 1-minute case at minimum battery voltage the SPLC1202 draws about 321 A, briefly above the 315 A 1-minute rating; the Kakadu 120 supports this pairing. At nominal voltage it draws 256 A.*

## Conclusion

A **single Kakadu 120 cabinet carries the continuous, 60-minute and 30-minute loads of either the 15 kW SPLC1200 or the 20 kW SPLC1202** below its 300 A continuous discharge rating. The SPLC1200’s 1-minute surge also stays under the 315 A 1-minute peak rating. The SPLC1202’s 1-minute surge at minimum battery voltage (about 321 A) is briefly above that rating; the Kakadu 120 supports this pairing.

## Notes & Assumptions